Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73cfa92f395e97d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 21:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12c3be4fd5d82d6a7f882cfc83b9ae8d SHA-1: 33b3909a91758df50fb1d26fac9561a5e8acf027 SHA-256: b73cfa92f395e97d6e7b4b49df71307560a7296c0a3efe542675133e3ab847ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=android+switch+audio+output PDF link annotation
    • http://orthocarecentroortopedico.it/userfiles/files/40809940800.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/94090689339.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/58094373428.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/14225983710.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f62006f2d0---30679547681.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e2659988.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3549f21dfef5340767e27edbd20dd862/vibupijovaxuj.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/66465216280.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/87093024059.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/77881277622.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f8341948---dapaderu.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/wuwewumeromobeluxu.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/weberitosojuluninerazoviw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11krh956smb2sip5eps4j6teg3/novepuzuxonazepopubofibom.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc63b8341---75326872467.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/22545866750.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/xuvenuzapen.pdfIn PDF document text
    • http://immopolignano.lu/images/fatepuvot.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/045720uo2b3q6nvil42e92vqc1/22592612094.pdfIn PDF document text
    • https://ijpdua.com/contents/files/77714923303.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161441f6cc016f---73277090203.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 17812 bytes
SHA-256: 5903e1da6bb1d97b9eaba7fcb23b189123b2e34faa051bc9bb34f8bdbcb806e9
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 10600 bytes
SHA-256: aed864528a82cc744e0e3687ad509fc3e1df87fc3cc7e3c90ec5f97418a8479e

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